Compression to C/R conversion

[CBrown1500@aol.com]

Greetings all,

I've been following the string regarding finding compression ratio from
cylinder pressure. 

In the April '96 issue of Classic Cars, in the Technical Queries column,
comes this chart: 

Compression 
ratio               6:1     7:1      8:1     9:1     10:1     11:1
Pressure
(psi)              108     123     131    152     167      181 

These pressures are based on a fully charged battery, warm engine, and
throttles wide open. And, they state this is an "estimate"--there are so many
variables.

Charlie B.